Originally Posted by
Hemituna
Exhaust numbers you have are correct. Do be aware that when you advance the cam, the intake numbers get smaller and the exhaust numbers bigger to either side of the 123.
That is why I said to start out at Exh 124.5 (which is really straight up 123/123).
You will find the PD blower engines dont like the cam moving much and the old skool thinking of advancing the cam at low rpm doesn't work so well here either.
As you have boost on demand low down, more intake advance is not ideal and a later intake open & close keeps cyl pressures down some so you can get more (some) timing in them at low rpm.
The exhaust cam timing works better when not too advanced also, hence my recommendation to start out straight up 123 everywhere.
Have a look at an OE demon tune, they barely move the cam a degree or 2 from straight up and trust me that the factory engineers are not dumb.